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Period integrals and the Riemann-Hilbert correspondence. (English) Zbl 1387.14042
A tautological system, introduced in [B. H. Lian et al., J. Eur. Math. Soc. (JEMS) 15, No. 4, 1457–1483 (2013; Zbl 1272.14033)] and [B. H. Lian and S.-T. Yau, Invent. Math. 191, No. 1, 35–89 (2013; Zbl 1276.32004)], arises as a regular holonomic system of partial differential equations that governs the period integrals of a family of complete intersections in a complex manifold \(X\), equipped with a suitable Lie group action. A geometric formula for the holonomic rank of such a system was conjectured in [S. Bloch et al., J. Differ. Geom. 97, No. 1, 11–35 (2014; Zbl 1318.32027)], and was verified for the case of projective homogeneous space under an assumption. In this paper, the authors prove this conjecture in full generality. By means of the Riemann-Hilbert correspondence and Fourier transforms, they also generalize the rank formula to an arbitrary projective manifold with a group action.

14D05 Structure of families (Picard-Lefschetz, monodromy, etc.)
14C30 Transcendental methods, Hodge theory (algebro-geometric aspects)
14D07 Variation of Hodge structures (algebro-geometric aspects)
53D37 Symplectic aspects of mirror symmetry, homological mirror symmetry, and Fukaya category
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